Q:

During the !him week of development:

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During the !him week of development:


  1. the heart primordium becomes located ventral to the pharynx
  2. the neural fold fuse at the posterior neuropore
  3. the last somite is formed
  4. epiblast cells involute at the primitive streak
  5. amnioblasts grow out from the epiblast to form the amnion

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D. epiblast cells involute at the primitive streak

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